/* acuff — stark minimal, dark default. ~150 lines, system fonts, no framework. */

:root {
  --bg: #0a0a0a;
  --fg: #e8e8e8;
  --fg-dim: #888;
  --accent: #6cf;
  --user: #1a1a1a;
  --assist: #141414;
  --border: #222;
  --error: #f55;
  font-family: -apple-system, system-ui, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--fg);
  font-size: 15px;
  line-height: 1.5;
}

body {
  display: flex;
  flex-direction: column;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}

.brand {
  font-weight: 600;
  letter-spacing: 0.02em;
}

.conn {
  color: var(--fg-dim);
  font-variant-numeric: tabular-nums;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 12px;
}
.conn.ok { color: var(--accent); }
.conn.err { color: var(--error); }

.chat {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  max-width: 760px;
  width: 100%;
  margin: 0 auto;
}

.msglist {
  flex: 1;
  overflow-y: auto;
  padding: 24px 20px 12px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.msg {
  padding: 10px 14px;
  border-radius: 8px;
  white-space: pre-wrap;
  word-wrap: break-word;
  max-width: 85%;
}
.msg.user {
  background: var(--user);
  align-self: flex-end;
}
.msg.assistant {
  background: var(--assist);
  border: 1px solid var(--border);
  align-self: flex-start;
}
.msg.system, .msg.error {
  font-size: 12px;
  color: var(--fg-dim);
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  align-self: center;
  text-align: center;
  border: none;
  background: transparent;
}
.msg.error { color: var(--error); }

.composer {
  display: flex;
  gap: 8px;
  padding: 12px 20px 20px;
  border-top: 1px solid var(--border);
}

#input {
  flex: 1;
  background: var(--user);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  font: inherit;
  font-size: 15px;
  resize: none;
  outline: none;
  max-height: 200px;
}
#input:focus { border-color: var(--accent); }

#send {
  background: var(--user);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0 14px;
  font: inherit;
  font-size: 18px;
  cursor: pointer;
  transition: all 0.1s;
}
#send:hover { background: var(--assist); border-color: var(--accent); color: var(--accent); }
#send:disabled { opacity: 0.4; cursor: not-allowed; }

@media (prefers-color-scheme: light) {
  :root {
    --bg: #fcfcfc;
    --fg: #1a1a1a;
    --fg-dim: #888;
    --user: #f3f3f3;
    --assist: #fafafa;
    --border: #e5e5e5;
    --accent: #06c;
  }
}